Security systems
CA 2279948 C · Owner: British Telecommunications Public Limited Company · Inventors: Hopkins, Jonathan; Reeder, Stephen Michael; Bradley, David William
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A security system includes a service platform (4) attached to a telephone network and accessible through the network. The platform (4) is responsive to calling line identity signals (CLI) provided by the network operator to identify individual telephone lines (7) from which calls originate and in response thereto to transmit a data list identifying protected apparatus (5) at customer premises (3) and release codes therefor. A home control centre (2) is responsive to signals received over a mains electricity line from protected apparatus (5) to transmit to the apparatus a release code the apparatus , including a security module responsive to receipt of the respective release code to …
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed February 4, 1998 and granted April 23, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 4, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 4, 2020.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.